PIX lan-to-lan IPSEC comes up...no traffic passes tunnel

I managed to setup a LAN-to-LAN IPSEC tunnel between PIX 515 (IOS 6.3)
on one end and a back-to-back ISA2004 on the other end.

I can initiate a tunnel at both ends however the following happens:

When I initate a tunnel from the ISA site the tunnel comes up and all
wanted traffic flows through the tunnel (RDP, HTTP, ICMP etc)
At that same moment I can also create the same traffic from the PIX
site.

When I initiate a tunnel from the PIX site the tunnel comes up but NO
traffic is passed through the tunnel.
Creating traffic on the ISA site causes the creation of another
tunnel.

My guess is ACL listst not being what they should be. Can anyone tell
me what I am missing in the config of my PIX config?
Traffic to LAN 10.1.0.0 /16 should go through the tunnel

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